ModelSim Altera Starter Edtion 10.0d - set EndTime

Altera_Forum · ‎10-02-2012

The Simulate - Runtime Option, lets me define a default Run time of say 1us. Then upon Simulate - Start simulation, the view changes, goes to Simulate and The Run Length can be checked, it still is 1us. Upon Run -All, the executed time ends at 10ns, coincidental the cycle time of the simulation.

I somehow wasn't able to find the proper way to set the end time.

Rene

Altera_Forum · ‎10-02-2012

It will stop automatically if there is not more similation to run (eg. your clock has stopped clocking).

Altera_Forum · ‎10-02-2012

Naa. It didn't even start. It stops after 10ns, and I have a cycle time of 10ns.

Altera_Forum · ‎10-02-2012

could it be stuck in an infinite loop?

can you post some source code?

Altera_Forum · ‎10-02-2012

I'm a couple steps further. Indeed the simulation runs until no changes occur. Meaning I have to gate the clock like :

-- Clock Generator

process begin

clock <='0';

wait until Reset = '1';

wait for clockcycle;

while Reset = '1' loop

clock <= '1';

wait for clockcycle/2;

clock <= '0';

wait for clockcycle/2;

end loop;

wait;

end process;

The gate process :

-- Reset

process begin

Reset <= '0';

wait for Clockcycle;

Reset <= '1';

wait for EndOfTime;

Reset <= '0';

wait;

end process;

Otherwise it runs forever. Clearly ignoring my wish with the End Time.

And even stranger, I have to set the stuff up with a reset = 1 otherwise it also runs forever without a result.

-- main

begin

data <= "00000011";

latch <= '1';

cnten <= '1' ;

Reset <= '1'; -- must be 1 here !!!

Now, at least I get a simulation going...

Thanks a lot this far.

Altera_Forum · ‎10-02-2012

you cannot assign reset inside and outside the process. This will cause reset to be 'X'